Malicious PDF — malware analysis report

Static analysis result for SHA-256 28859c63edff5dcd…

MALICIOUS

PDF

69.5 KB Created: 2021-09-17 16:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1700b2bd477a03c7dc7f227dd26df892 SHA-1: abce69631016c05b3ef241cca1c37df26c769d31 SHA-256: 28859c63edff5dcd0f82ca59f559cc48e9aa9dfa0254a4b88dbe09f2a44fef0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=android+os+usb+bootable PDF link annotation
    • http://chochosanencino.com/uploads/files/xedinekixiputuzu.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/d350caeb2c6821dbd08eaa920e4483ea/25293609471.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/41408622264.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/84861158981.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/pezalosipitiwowanuvuvadi.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/dujafawedares.pdfIn PDF document text
    • http://polletnv.be/uploads/files/51601898076.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613518fede271---xidaborilujujomob.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862762d400---90849023511.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/niveripo.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/48811240091.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/resuraredetofadufudivanu.pdfIn PDF document text
    • http://skncn.com/u/files/22107428321.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/95819460500.pdfIn PDF document text
    • http://airzo.net/userData/board/file/57759539631.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/96017999120.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394cfd717c9---1464612743.pdfIn PDF document text
    • https://j26clean.com/upload/files/sorutanenete.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/kunemememimunolebesixixip.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/jojaloro.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/67954277094.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/jupoj.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/gadirodaputonujuv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB178 15216 bytes
SHA-256: 6ecbac5a6865a7dee2612a26a2fc2cb1c4f9146713d6bf0390c7816ab2a83628
font_01_sfnt_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 10460 bytes
SHA-256: a325a1feade754ea66b0e3a3e9791801793d7d70666f78c0eda4d07517b38496

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